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dc.contributor.author | ZHANG, YING-LI | en |
dc.contributor.author | SASAKI, MISAO | en |
dc.date.accessioned | 2012-04-11T07:16:23Z | - |
dc.date.available | 2012-04-11T07:16:23Z | - |
dc.date.issued | 2012-01 | - |
dc.identifier.issn | 0218-2718 | - |
dc.identifier.uri | http://hdl.handle.net/2433/154864 | - |
dc.description.abstract | We consider a model of non-local gravity with a large bare cosmological constant, Λ, and study its cosmological solutions. The model is characterized by a function f(ψ) = f0e[αψ], where ψ = □[-1]R and α is a real dimensionless parameter. In the absence of matter, we find an expanding universe solution a ∝ t[n] with n < 1, that is, a universe with decelerated expansion without any fine-tuning of the parameter. Thus the effect of the cosmological constant is effectively shielded in this solution. It has been known that solutions in non-local gravity often suffer from the existence of ghost modes. In the present case, we find the solution is ghost-free if α > α[cr] ≈ 0.17. This is quite a weak condition. We argue that the solution is stable against the inclusion of matter fields. Thus our solution opens up new possibilities for solution to the cosmological constant problem. | en |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | World Scientific Publishing | en |
dc.rights | © 2012 World Scientific Publishing Co. | en |
dc.rights | この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 | ja |
dc.rights | This is not the published version. Please cite only the published version. | en |
dc.subject | Non-local gravity | en |
dc.subject | cosmological constant problem | en |
dc.subject | ghost-free condition | en |
dc.subject | power-law solution | en |
dc.title | SCREENING OF COSMOLOGICAL CONSTANT IN NON-LOCAL COSMOLOGY | en |
dc.type | journal article | - |
dc.type.niitype | Journal Article | - |
dc.identifier.ncid | AA10928782 | - |
dc.identifier.jtitle | International Journal of Modern Physics D | en |
dc.identifier.volume | 21 | - |
dc.identifier.issue | 01 | - |
dc.relation.doi | 10.1142/S021827181250006X | - |
dc.textversion | author | - |
dc.identifier.artnum | 1250006 | - |
dcterms.accessRights | open access | - |
出現コレクション: | 学術雑誌掲載論文等 |
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